/*

 * Copyright (c) 2014, Oracle America, Inc.

 * All rights reserved.

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 * modification, are permitted provided that the following conditions are met:

 *

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 *    this list of conditions and the following disclaimer.

 *

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 *    notice, this list of conditions and the following disclaimer in the

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 *    to endorse or promote products derived from this software without

 *    specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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package org.openjdk.jmh.samples;


import org.openjdk.jmh.annotations.Benchmark;

import org.openjdk.jmh.annotations.Scope;

import org.openjdk.jmh.annotations.State;

import org.openjdk.jmh.runner.Runner;

import org.openjdk.jmh.runner.RunnerException;

import org.openjdk.jmh.runner.options.Options;

import org.openjdk.jmh.runner.options.OptionsBuilder;


/*

 * Fortunately, in many cases you just need a single state object.

 * In that case, we can mark the benchmark instance itself to be

 * the @State. Then, we can reference its own fields as any

 * Java program does.

 */


@State(Scope.Thread)

public class JMHSample_04_DefaultState {


    double x = Math.PI;


    @Benchmark

    public void measure() {

        x++;

    }


    /*

     * ============================== HOW TO RUN THIS TEST: ====================================

     *

     * You can see the benchmark runs as usual.

     *

     * You can run this test:

     *

     * a) Via the command line:

     *    $ mvn clean install

     *    $ java -jar target/benchmarks.jar JMHSample_04 -f 1

     *    (we requested single fork; there are also other options, see -h)

     *

     * b) Via the Java API:

     *    (see the JMH homepage for possible caveats when running from IDE:

     *      http://openjdk.java.net/projects/code-tools/jmh/)

     */


    public static void main(String[] args) throws RunnerException {

        Options opt = new OptionsBuilder()

                .include(JMHSample_04_DefaultState.class.getSimpleName())

                .forks(1)

                .build();


        new Runner(opt).run();

    }

// 本例介绍了 @State 注解可以直接写在 Benchmark 的测试类上，表明类的所有属性的作用域。
}

